ValidValidator1.php

<?php

namespace Symfony\Component\Validator\Constraints;

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class ValidValidator extends ConstraintValidator
{
    public function isValid($value, Constraint $constraint)
    {
        if ($value === null) {
            return true;
        }

        $walker = $this->context->getGraphWalker();
        $group = $this->context->getGroup();
        $propertyPath = $this->context->getPropertyPath();
        $factory = $this->context->getClassMetadataFactory();

        if (is_array($value)) {
            foreach ($value as $key => $element) {
                $walker->walkConstraint($constraint, $element, $group, $propertyPath.'['.$key.']');
            }
        } else if (!is_object($value)) {
            throw new UnexpectedTypeException($value, 'object or array');
        } else if ($constraint->class && !$value instanceof $constraint->class) {
            $this->setMessage($constraint->message, array('{{ class }}' => $constraint->class));

            return false;
        } else {
            $metadata = $factory->getClassMetadata(get_class($value));
            $walker->walkClass($metadata, $value, $group, $propertyPath);

            if ($value instanceof \Traversable) {
                foreach ($value as $key => $element) {
                    $walker->walkConstraint($constraint, $element, $group, $propertyPath.'['.$key.']');
                }
            }
        }

        return true;
    }
}

ValidValidator2.php

<?php

namespace Symfony\Component\Validator\Constraints;

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

class ValidValidator extends ConstraintValidator
{
    public function isValid($value, Constraint $constraint)
    {
        if ($value === null) {
            return true;
        }

        $walker = $this->context->getGraphWalker();
        $group = $this->context->getGroup();
        $propertyPath = $this->context->getPropertyPath();
        $factory = $this->context->getClassMetadataFactory();

        if (!is_array($value) && !is_object($value)) {
            throw new UnexpectedTypeException($value, 'object or array');
        } else if ($constraint->class && !$value instanceof $constraint->class) {
            $this->setMessage($constraint->message, array('{{ class }}' => $constraint->class));

            return false;
        } else if (!is_array($value)) {
            $metadata = $factory->getClassMetadata(get_class($value));
            $walker->walkClass($metadata, $value, $group, $propertyPath);
        }
        
        if (is_array($value) || $value instanceof \Traversable) {
            foreach ($value as $key => $element) {
                $walker->walkConstraint($constraint, $element, $group, $propertyPath.'['.$key.']');
            }
        }

        return true;
    }
}